# Thermal Engineering Exam: Quiz!

50 Questions | Total Attempts: 117  Settings Create your own Quiz • 1.
What state the first law of Thermodynamics?
• A.

Conservation of Energy

• B.

Conservation of Mass

• C.

Conservation of Momentum

• D.

Conservation of Charge

• 2.
What states the second law of Thermodynamics?
• A.

All the heat entering in a system cannot be transformed to work

• B.

Entropy is always positive

• C.

Conservation of Charge

• D.

Force equilibrium

• 3.
What describes the Navier Stokes equations?
• A.

Conduction heat transfer behavior

• B.

Fluid mechanics behavior

• C.

Combustion inside a piston-cylinder assembly

• D.

Rotary Machinery

• 4.
The compression ratio of an SI engine is in the range of:
• A.

4 to 6

• B.

6 to 10

• C.

6 to 8

• D.

10 to 14

• 5.
The ignition quality of diesel fuel is indicated by:
• A.

Octane number

• B.

Cetane number

• C.

Flash point

• D.

Fire point

• 6.
When air is adiabatically saturated, the temperature attained is:
• A.

Dew point temperature

• B.

Wet bulb temperature

• C.

Dry bulb temperature

• D.

Triple point temperature

• 7.
A streamline and an equipotential line in a flow field.
• A.

Are parallel to each other

• B.

Are perpendicular to each other

• C.

Intersect at an acute angle

• D.

Are identical

• 8.
Which of the following is not a scalar quantity?
• A.

Force

• B.

Speed

• C.

Velocity

• D.

Acceleration

• 9.
In ideal machines, mechanical advantage is __________ velocity ratio.
• A.

A.equal to

• B.

B.less than

• C.

C.greater than

• D.

D.None of the above

• 10.
The units of kinematic viscosity are
• A.

Kg/m2-sec

• B.

Kg sec/m2

• C.

M/kg sec

• D.

M2/sec.

• E.

All of the Above

• 11.
Density in terms of viscosity is
• A.

Kinematic viscosity/Dynamic viscosity

• B.

Kinematic viscosity x dynamic viscosity

• C.

Dynamic viscosity/Kinematic viscosity

• D.

Any of the above

• E.

All of the Above

• 12.
An object having 20 kg mass weighs 19.60 kg on a spring type balance. The value of 'g' in m/sec2 for the place is
• A.

1000

• B.

9.8

• C.

9.9

• D.

10.2

• E.

10.1

• 13.
A pilot tube is used for the measurement of
• A.

Pressure

• B.

Velocity

• C.

Viscosity

• D.

Surface tension

• E.

Flow rate

• 14.
A hydrometer is used to determine
• A.

Relative humidity

• B.

Buoyancy force

• C.

Specific gravity of liquids

• D.

Viscosity of liquids

• E.

Surface tension

• 15.
If the particles of a fluid attain such velocities that vary from point to point in magnitude and direction as well as from instant to instant, the flow is said to be
• A.

Uniform flow

• B.

• C.

Turbulent flow

• D.

Laminar flow

• E.

None of the above

• 16.
The equation of continuity of flow is based on the principle of conservation of
• A.

Momentum

• B.

Mass

• C.

Energy

• D.

All above

• E.

None of the above

• 17.
Sensible heat is
• A.

That heat which causes change of state

• B.

That heat which produces a rise of temperature

• C.

That heat which produces a rise of temperature

• D.

That can only be sensed by a thermometer

• E.

None of the above

• 18.
Specific heat is
• A.

The amount of heat required to raise the temperature of a unit quantity of substance through 1?C

• B.

The amount of heat requred to change the state or condition under which a substance exists without changing its temperature

• C.

The ratio of quantity of heat required to raise the temperature of a given weight of any substance through 1?C to the quantity of heat required to raise the temperature of same weight of water through 1?C

• D.

The heat sensed by a mercury thermometer

• E.

None of the above

• 19.
Latent heat is
• A.

Heat cannot be detected

• B.

Heat that does not follow first law of thermodynamics

• C.

Heat required to change the substance from solid to gaseous state

• D.

Heat required to change the state of substance from liquid state to solid state

• E.

Heat required to change the state or condition under which the substance exists

• 20.
The equilibrium conditions between supersaurated vapour and a cooled liquid surface are expressed in
• A.

Calender's equation

• B.

Dalton's equation

• C.

Kelvin Helmhotz equation

• D.

Napier's equation

• E.

Clapcyron's equation

• 21.
An optical pyrometer works on the principle of
• A.

Expansion of fluids

• B.

Change of electrical resistance

• C.

Thermo-electric effect

• D.

• E.

• 22.
Intercooling in multistage compressors is done
• A.

To cool the air at delivery

• B.

To enable use of small cylinders and eliminate problems of unbalanced forces

• C.

To minimise the work of compression

• D.

To supply-air at two different pressures for use

• E.

To cool air during compression

• 23.
• A.

No heat leaves or enters the system

• B.

Maximum work is done

• C.

Specific heat remains constant

• D.

Temperature remains constant

• E.

None of the above

• 24.
Stoichiometric ratio is
• A.

Chemically correct air-fuel ratio by volume

• B.

Chemically correct air-fuel ratio by weight

• C.

Theoretical mixture of air for complete combustion

• D.

Actual ratio of air to fuel for maximum efficiency

• E.

None of the above

• 25.
A rich mixture will have an air-fuel ratio
• A.

Less than chemically correct

• B.

More than chemically correct

• C.

Chemically correct

• D.

Any of the above

• E.

None of the above

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